Aircraft Ignition Switch AN3212-1
This is a WWII-era aircraft Ignition Switch as used in numerous single engine aircraft of the ear, such as the US Army Air Force P-51 Mustang and US Navy Fighter F4U Corsair, according to their parts lists of that era.
The switch rotates to each position on the dial. Measures ~2.5 inches diameter and ~3 inches long. The internal part of the rear connector has been removed, so this should be considered for static display or core for repair. It appears to have been cosmetically refreshed.